216666908 has 12 divisors (see below), whose sum is σ = 381583272. Its totient is φ = 107643120.

The previous prime is 216666893. The next prime is 216666941. The reversal of 216666908 is 809666612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171878 + ... + 173133.

It is an arithmetic number, because the mean of its divisors is an integer number (31798606).

Almost surely, 2^216666908 is an apocalyptic number.

It is an amenable number.

216666908 is a deficient number, since it is larger than the sum of its proper divisors (164916364).

216666908 is a wasteful number, since it uses less digits than its factorization.

216666908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345172 (or 345170 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 216666908 is about 14719.6096415632. The cubic root of 216666908 is about 600.6168729696.

The spelling of 216666908 in words is "two hundred sixteen million, six hundred sixty-six thousand, nine hundred eight".